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功能：让坦克动起来

内容：改变位置，坦克就会动。a.设置成员变量，x  ,  y;

                                                        b.每一段时间重画一次：y+=5;

                                                        c.重画线程类。（优点：线程重画坦克，比较均匀。）

public class TankClient extends Frame {	int x = 30; int y = 30;                //定义在方法外面	public void paint(Graphics g) {		Color c = g.getColor();		g.setColor(Color.RED);		g.fillOval(x, y, 30, 40);		g.setColor(c);				y += 5;	}	public void lauchFrame(){		this.setSize(800,600);		this.setTitle("TankWar");		this.setLocation(80, 60);		this.setVisible(true);		this.addWindowListener(new WindowAdapter(){			public void windowClosing(WindowEvent e) {			    System.exit(0);				}		});		this.setResizable(false);		new Thread(new paintThread()).start();	}	public static void main(String[] args) {		TankClient tc = new TankClient();		tc.lauchFrame();	}	private class paintThread implements Runnable {   //线程 内部类 为此线程服务		public void run() {			while(true){				repaint();				try {					Thread.sleep(50);				} catch (Exception e) {					e.printStackTrace();				}			}		}			}	}

private class paintThread implements Runnable {   //线程 内部类 为此线程服务		public void run() {			while(true){				repaint();				try {					Thread.sleep(50);				} catch (Exception e) {					e.printStackTrace();				}			}		}			}

启动线程：

new Thread(new paintThread()).start();

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